1: With N,N,N',N',N'',N''-hexamethylphosphoric triamide in tetrahydrofuran T=-30°C; 0.25 h; 2: With lead(IV) acetate; acetic acid in tetrahydrofuran; dichloromethane T=-30 - 20°C; Title compound not separated from byproducts;

1: 66 percent / conc. sulfuric acid, fuming nitric acid / 0.17 h / Ambient temperature 2: 80 percent / p-toluenesulfonic acid / 0.5 h / Heating 3: 51 percent / potassium ethoxide, diethyl oxalate / dimethylformamide / 12 h / Ambient temperature View Scheme

Δ;

2: Δ View Scheme

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